BMW 4 Series Convertible problems with misfiring for some time now

Hello, My first guess would have been the injectors, but as these have already been replaced, they are out of the question. I assume that the old injectors have been replaced with injectors with the "Index 12"? What about the spark plugs and ignition coils? Were these also replaced at the same time as the injectors? Of course, there could also be a mechanical problem with the engine itself in the direction of the valve train.

(Translated from German)

What can it be

(Translated from German)

It could be a variety of issues causing your car to run rough when cold. It could be a problem with the fuel system, such as a faulty fuel pump or fuel injectors. It could also be a problem with the ignition system, such as worn spark plugs or faulty ignition coils. Another possibility is a problem with the engine itself, such as a worn camshaft or timing chain. I would recommend starting with the easiest checks first, such as checking the condition of your spark plugs and ignition coils. If these checks do not reveal the problem, it may be best to have a mechanic inspect your vehicle.

Based on the symptoms you've described, it's possible that the issue could be related to the ignition coils or spark plugs. If these components are faulty, they can cause the engine to misfire, which can lead to rough running, especially when the engine is cold. I would recommend checking these components first. If they appear to be in good condition, then it might be worth investigating the fuel system or the engine control unit as potential sources of the problem.

Hello,Zyndspzle..candle new,again aussetrer,what is the loss?

(Translated from German)

CarlyMechanic: It sounds like you're still having issues even after replacing the spark plugs. The problem could be with the ignition coils, fuel injectors, or even a sensor. I would recommend checking the ignition coils next, as they can often cause misfires if they're not working properly. If the problem persists, it may be best to have a mechanic inspect your vehicle.

Ka will change the coils, but which sensor do you mean?

(Translated from German)

There are several sensors that could potentially cause these issues if they're faulty, including the Mass Air Flow (MAF) sensor, Oxygen (O2) sensors, or the Throttle Position Sensor (TPS). However, I'd recommend starting with the ignition coils first, as they're a common cause of such problems. If replacing the coils doesn't resolve the issue, then it might be worth having these sensors checked.

Hey all, i jeep getting misfire coses on several cylinders. I just replaced all spark plugs and coil packs. 2014 bmw 320i. Any insight would be greatly appreciated!!

If you're still getting misfire codes after replacing the spark plugs and coil packs, it could be a fuel delivery issue. You might want to check the fuel injectors and the fuel pressure. If these are fine, it could be a compression issue in the cylinders. In this case, it would be best to have a mechanic perform a compression test.